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Variable Interest Entities (Narrative) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
variable_interest_entities
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]    
Variable interest entities, number of entities | variable_interest_entities 1  
Consolidated VIE assets $ 73,882,299 $ 71,688,579
Consolidated VIE liabilities 67,586,564 $ 65,339,591
Variable Interest Entities    
Variable Interest Entity [Line Items]    
Consolidated VIE assets 284,800  
Consolidated VIE liabilities $ 16,400